Machine



2 Sheets-Sheet 1.

(No Model.)

' D. ROCHE.

. BALL GRINDING MACHINE.

No. 588,915. Patented Aug. 24,1897.

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D. ROCHE.

- h BALL GRINDING MACHINE. v No. 588,915. Patented Aug. 24,1897.

'7 UNITED STATES PATENT Erica.

DAVID ROCHE, OF CLEVELAND, OHIO, ASSIGIQOR OF SEVEN-EIGHTHS TO F. H. KELLY, T. M. VARNER, AND A. G. HARBAUGH, OF SAME PLACE.

BALL-GRINDING MACHINE.

SPECIFICATION forming part of Letters Patent NO. 588,915, dated August 24, 1897.

Application filed December 1, 1896. Serial No. 614,153. (No model.)

The object of my invention is to provide a cheap, simple, and practical machine wherewith the more or less imperfect balls from a turning-machine may be quickly and accurately ground into true spherical form.

The invention consists in the construction and combination of parts hereinafter described and claimed.

In the drawings, Figure l is a plan view of my machine. Fig. 2 is an end view thereof. Fig. 3 is a front elevation thereof. Fig. 4 is a face view of the disk which supports the ball-raceways. Figs. 5 and 6 are sectional views on line 5 and 6 of Fig. at, showing the key in two diiferent positions.

Referring to the parts by letter, A repre sents the bed-plate of the machine, and B a shaft suitably mounted thereon. C represents a grinding-wheel which is secured to the end of this shaft.

D represents a longitudinally-movable slide mounted on guides a a and adjustable toward and from the grinding-wheelby a screw d.

E represents a slide transversely movable upon the slide D, this slide E carrying a vertical plate e, which is parallel to the grindingface of the grinding-wheel C.

G represents a disk having a stud g, which is journaled in the plate 6 in line with the shaftB. This disk is duringthe grinding operation rigidly secured to the plate e by a clamping-screw e.

. Secured to that side of the disk which faces the grinding-wheel is a hard-metal ring F, across which at one .point a radial keyway f is cut, and f represents the key, which is fitted therein, its outer face being flush with the face of the ring. The depth of this keyway must be slightly'greater than the diameter of the balls, since it is through this key* way that the balls are admitted to the ballraceways 9 Each ball-raceway is formed by two concentric rings H, of differentdiameters, which are secured to the-ring F. The outer periphery of the inner ring and the inner periphery of the outer ring are undercut, whereby the raceways decrease in width from the ring F outward, being too narrow at their outer edges to permit the balls to pass through; The thickness of the rings H is less than the diameter of the balls, whereby a small portion of said balls project from the raceway. Two of these raceways are shown, but any desired number could be formed, as described.

The slide E is moved forward and backward continuously by a pitman J, pivoted to it and to a crank-pin k on a disk 75*, which is fast upon shaft K. Motion is transmitted to this shaft K through gears k and n, secured, respectively, to shafts K and N. The latter shaft is rotated by a belt running over pulleysn and b on the two shafts Nand B.

To fill either racewaywith balls, the key f is drawn inward past said raceway and the balls are dropped into the keyway, from which they iiow into the said raceway.

The slide D is moved toward the grindingwheel until the balls touch the grinding-surface. Then as the grinding-wheel revolves the slide E is moved backward and forward. The two movements cause the balls to so revolve in their raceways that all parts of their surfaces are ground smoothly and symmetrically, and at the same time no grooves are worn in the grinding-wheel.

\Vhen the balls are ground sufficiently, the slide D is moved backward, and the disk G is rotated until the keyway is at the lowest point. The key is then drawn inward and the balls roll out through the keyway.

Having described my invention, I claim- 1. In a ball-grinding machine, in combination, a revolving grinding-wheel, a slide D adjustable toward and from the grinding-face of said wheel, a transversely-movable slide E mounted on the slide D, and means for imparting to the slide E a reciprocating motion, an upright disk secured upon the slide E, and two concentric rings of different diameters on the face of said disk, the proximate pcripheries of said rings being undercut, and means for introducing the balls into the raceway formed between said rings, substantially as and for the purpose specified.

2. In a ball-grinding machine, in combination, a revolving grinding-wheel, a slide D adjustable toward and from the grinding-face of said wheel, a transversely-movable slide E mounted on the slide D, and means for im parting to the slide E a reciprocating motion, an upright disk secured upon the slide E, a hard-metal disk F secured to the face of this disk having a keyway across it, a movable key fitted in said keyway, and two concentric rings of ditferent diameters secured to the ring F, the proximate peripheries of said rings being undercut, substantially as and for the purpose specified.

In a ball-grinding machine,in combination, a revolving grinding-wheel, a slide D adjustable toward and from the grindingface of said wheel, a transversely-movable slide E mounted on the slide D and means for imparting to the slide E a reciprocating motion, a vertical plate carried by said slide E, a disk pivoted to said plate, a clamping device for rigidly con necting said disk and plate. ahardmeta-l disk F secured to the face of this disk having a keyway across it, a movable key fitted in said keyway, and two concentric rings of different diameters secured to the ring F, the proximate peripheries of said rings being undercut, substantially as and for the purpose specified.

In testimony whereof I affix my signature in presence of two witnesses.

DAVID ROCHE. Vitnesscs:

E. L. THURSTON, F. P. MILLER. 

